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Follow this guide to replace the sheave on an EDCO Disk Grinder model 50200-HD.
This repair requires two people.
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Ensure the machine is unplugged.
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Turn the power switch counterclockwise into the OFF position.
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Use a 9/16 inch socket to remove the two bolts securing the weighted hood.
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Use a 9/16 inch socket to loosen the bolts securing the motor mount.
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Slide the motor towards the front of the machine as far as it will go to loosen the belt tension.
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Use a 9/16 inch socket to tighten the four bolts back down to lock the motor in a position where there's the least belt tension.
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Tilt the front of the machine up and rest the handlebars on the ground.
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Pinch a flathead screwdriver between the belt and sheave.
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Rotate the sheave and pivot the belt up and away from its groove.
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Continue to rotate the sheave with once hand while holding the flathead screwdriver with the other to fully dislodge the belt from the groove.
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Remove the belt from the motor pulley, then fully remove it from the machine.
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Tilt the machine back into working position.
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Use a 5/32 inch hex wrench to loosen the set screw securing the sheave to the head assembly shaft.
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Lift the sheave straight up off of the head assembly shaft.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.